Section 4 - Document Locator Number - Internal Revenue Service
4-2. Updated campus location codes. 4-3. New information on 1040 Online Filing
Program. 4-6. 2 DLN Composition. (1) The document locator number (DLN) is a
controlled number assigned to every return or document input through the ADP
system. The fourteenth (last) digit is the year of processing and is assigned by the
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